I'll leave a voicemail.
Stress 'se-gre-te-RI-a'. 'Messaggio' = mes-SAG-gio.
Use this when you're about to leave a voicemail message. In Italy, voicemail ('segreteria telefonica') is still used, though WhatsApp voice messages are increasingly preferred.
'Segreteria telefonica' = voicemail (literally 'telephone secretary'). 'Lasciare un messaggio in segreteria' = to leave a voicemail. When the voicemail message starts in Italian, you'll typically hear: 'Lasciate un messaggio dopo il segnale acustico' (Leave a message after the tone).
Non risponde. Vado in segreteria.
There's no answer. Going to voicemail.
Describing what happened.
Ho lasciato un messaggio in segreteria.
I left a voicemail.
Reporting that you did it.
Non uso più la segreteria. Preferisco WhatsApp.
I don't use voicemail anymore. I prefer WhatsApp.
Modern Italian preference.
Italian voicemail messages ('messaggi in segreteria') are a cultural art form — Italians tend to leave detailed, conversational voicemails rather than brief ones. However, young Italians under 35 overwhelmingly prefer WhatsApp voice messages ('messaggi vocali') over traditional voicemail, considering it more immediate and personal.